Failure Code [Ca2186] Throt Sens Sup Volt Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Failure code [CA2186] Throt Sens Sup Volt Low Error

Action code Failure code
E14 CA2186
Contents of
• Low voltage was detected in throttle sensor power supply circuit.
trouble
• If trouble occurs while starting switch is in ON position, controller fixes voltage value to level just
Action of con- before detection of trouble and continues operation.
troller • If starting switch is turned ON while voltage is abnormally high, controller continues operation with
voltage at 100% value.
Problem that
appears on • Engine speed cannot be controlled with fuel control dial.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Ground fault in wiring har-
ness
1
(Short circuit with GND cir-
cuit)
Short circuit in wiring har-
Possible causes
2 ness
and standard
(with another wiring harness)
value in normal
state
Defective wiring harness
3
connector
4 Defective engine controller
Circuit diagram related to fuel control dial
PC300, 350-8
Throttle sensor supply voltage low error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
Wiring harness between CE02 (female) (22)
– P20 (female) (1) and chassis ground
a
Between CE02 (female) (9) – each of CE02
(female) pins (With P20 disconnected)
Connecting parts between fuel control dial – machine wiring har-
ness – engine controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
If causes 1 and 3 are not detected, engine controller may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
SEN02630-05
1
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
43